Typewriting machine



May 2l, 1935- o. MICHELsEN 2,002,410

TYPEWRITING MACHINE Original Filed Sept. 5, 1934 Patented May 21,l 1935 TYPEWRITING MACHINE William 0. Michelsen, Long Island, N. Y., assignor to Royal Type ter Company, Inc., 4New York,

N.,Y., a corporation of New York l )Original application Sep Divided and amber 5,1934, serial No. this applicationv December 1K1, 1934, serial No. 151,044 l 5 claims. (ci. 19t-ss) This invention relates to new and useful improvements in typewriting or like machines generally, although more particularly to the carriage escapement mechanism thereof. n

This application' is a division of an application filed by me on Sept. `5', 1934, Serial No. 742,787, for improvements in Typewriting machines.

Among the several objects of my invention is to provide an escapement mechanism wherein a quiet action is produced between the escapement pinion and its back dog when the carriage is being moved in the opposite direction.

In the drawing:

Figure 1 is a rear elevation, partly in section, of an escapement mechanism constructed in accordance with my invention;

Figure 2 is a perspective view of the wiper cam and its support;

Figure 3 is an enlarged sectional View taken on the line 3-3 of Figure l; and

Figure 4 is a perspective view of a, modified form of cam.

In the accompanying drawing, 5 indicates the usual rack/which is attached to the carriage, and the main frame of the machine below the rack is a frame A for supporting the escapement mechanism. The frame A includes two spaced horizontal arms 6, 6 and an upwardly extending vertical arm (not shown) in which is journaled a shaft 8 on which is rotatable a pinion 9 having teeth IIJ for engaging the rack 5. Fixedto the shaft 8 is an escapement wheel II having teeth I2. A back dog I3 for the pinion 9 is pivoted as at I4 to the escapement wheel I I, and a spring B is employed to yieldably retain this back dog in engagement with the teeth I0 of the pinion 9. 4

The escapement wheel II is intermittently released during the step by step feeding movement of the carriage by the following noisereducing mechanism: Pivoted on the horizontal arms 6, 6 of the escapement supporting frame A as at 2l, 2I is a dog rocker C which carries a fixed dog 22 and a pivoted or limber dog 23 which intermittently engage the teeth I2 of the escapement wheel in the usual manner whenever the dog rocker C is rocked by the key levers. Rigidly connected to a bracket 24 which is xed to the rocker C at one side of the pivoted dog 23 is an upwardly projecting vertical arm 25. A ilexible U-shaped support 26 has one leg 21 rigidly connected to the lower end of the arm 25 by screws 2l, and extending laterally from the upper end of the other leg 29 towards the pivoted dog 23 ls an arm 30 to which a wiper cam 3I is pivoted as'at'32. This cam is provided -with a rock arm 33 to which is connected the upper end of a coil spring 34, the lower end of the spring being anchored to an ear 35 formed on' the bracket 24. By means of this construction the 5 cam is yieldingly held in constant wiping engagement with the pivoted dog 23, and functions to normally urge and rock said dog against alstop 36 xed to the frocker C. The stop 36 is preferably provided with a sound deadening pad 31 10 for receiving the pivoted dog 23 each time the latter is released fromA the `escapement wheel II upon movement of the rocker C. An adjusting screw 38, which is threadably engaged in the upper end of the arm 25, bears against the up- 15 per end of the spring leg 29 of the cam support 26 and functions to vary the lateral position of the cam and thereby regulate the amount of movement of the escapement wheel.

In operation, assuming the parts to be in their 20 normal positions, as viewed in Figure 1, the rocker C is rocked upon depression of a key lever and the pivoted dog 23 is thereby released from the tooth of the escapement wheel. The escapement wheel is then rotated by the carriage spring until 25 said released tooth engages the fixed dog 22, and simultaneously the pivoted dog is swung against the stop pad 31 by means of the wiper cam 3l and spring 34. The rocker C is then returned to its initial position by the usual return spring, 30 and the pivoted dog is thereby carried into the path of the next tooth of the escapement wheel, the latter being free to turn the pivoted dog 23 to its normal or starting position. Thus, instead of the dogs snapping against a fixed stop as in 35 machines of prior constructions, the dog will be eased into its state of rest by reason of its wiping contact with the cam 3|. Any noise which might be occasioned during the return movement of the pivoted dog 23 by reason of the latter contacting 40 the wiper cam 3l will be absorbed by the spring, leg 29 of the cam support 26. In Figure 4 I have illustrated a modified form of wiper cam 3|a which is provided with a longitudinal slot 39 forming a resultant yieldable cam finger 40 which 45 functions to absorb and thereby reduce any noise which might be occasioned by contact between the pivoteddog 23 and the wiper cam 3| in either of the pivoted movements of the dog.

I claim:

1. In a typewriting or like machine, an escapement mechanism including an escapement wheel, a dog rocker, a iixed dog and a movable dog mounted on the rocker and alternately movable into engagement with the teeth of the wheel, a 55 support mounted on the rocker for adjustments ment mechanism including an escapement wheel,

@ towards'and from the movable dog, a wiper cam a dog rocker, a fixed dog and a movable dog pivoted on the support and contacting the movmounted on the rocker and alternately movable able dog, and a spring connecting the cam and into engagement with the teeth of the wheel, a..

5 the rocker for holding the cam in yielding contact vertically disposed bracket arm xed to the 5 with th pivoted dog. rocker, a U-shaped spring support having one leg 2. In a typewriting or like machine, an escapefixed to the bracket arm, the other leg terminatment mechanism including an escapement wheel, ing in a laterally extending arm, a wiper cam piva dog rocker, a fixed .dog and a movable dog oted on said arm and contacting the movable dog,

1o mounted on the rocker and alternately movable and yieldable means connecting the cam and the 10 into engagement with the teeth of the wheel, a rocker for holding the cam in yielding contact spring arm mounted on the rocker, a wiper cam with the pivoted dog. pivoted on the spring arm and contacting the 5. In a typewriting or like machine, an escapemovable dog, and yieldable means connecting ment mechanism-including an escapement wheel, the cam and the rocker for holding the cam in a dog rocker, a xed dog and a movable dog 15 yielding contact with the pivoted dog. mounted on the rocker and alternately movable 3. In a typewrlting or like machine, an escapeinto engagement with the teeth of the wheel, a ment mechanism including an escapement wheel, vertically disposed bracket arm xed to the rocka dog rocker, a iixed dog and a movable dog er, a U-shaped spring support having one mounted on the rocker and alternately movable leg xed to the bracket arm, the other leg ter- 20 into engagement with the teeth of the wheel, minating in a laterally extending arm, a wiper a spring arm mounted on the rocker, a. wiper cam cam pivoted on said arm and contacting the pivoted `n the spring arm and contacting the movable dog, yieldable means connecting the cam movable dog, yieldable means connecting the and the rocker for 'holding the cam in yielding cam and the rocker for holding the cam in yieldcontact with the pivoted dog, and an adjusting ing contact with the pivoted dog, and an adjustscrew threadably mounted in the upper end of the ing screw mounted on the rocker and engaging vertical arm and engaging the upper end of the the spring arm for varying the lateral position. of spring support for varying the lateral position the cam pivot relative to the movable dog. of the cam pivot relative to the movable dog. i u 4. In a typewrlting or like machine, an escape- WILLIAM 0. MICHELSEN. 

